<template>
	<view>
		<view class="search-box">
			 <uni-search-bar @input="input" :radius="100" cancelButton="none" focus="true"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
		  <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
		    <view class="goods-name">{{item.goods_name}}</view>
		    <uni-icons type="arrowright" size="16"></uni-icons>
		  </view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
		  <!-- 标题区域 -->
		  <view class="history-title">
		    <text>搜索历史</text>
		    <uni-icons type="trash" size="17"  @click="clean()"></uni-icons>
		  </view>
		  <!-- 列表区域 -->
		  <view class="history-list">
		    <uni-tag :text="item" v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
		  </view>
		</view>
	</view>
</template>

<script>
	
	export default {
		data() {
			return {
				timer:null,
				//搜索关键词
				kw:'',
				//搜索的结果列表
				searchResults:[],
				historyList:[]
			}
		},
		onLoad(){
			this.historyList = Json.parse(uni.getStorage('kw') || '[]')
		},
		methods:{
			input(e){
			 clearTimeout(this.timer)
			 this.timer =	setTimeout(() =>{
					this.kw = e
					//根据关键词确定搜索列表
					 this.getSearchList()
				},500)
			},
			// 根据搜索关键词，搜索商品建议列表
			async getSearchList() {
			  // 判断关键词是否为空
			  if (this.kw === '') {
			    this.searchResults = []
			    return
			  }
			  // 发起请求，获取搜索建议列表
			  const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
			  if (res.meta.status !== 200) return uni.$showMsg()
			  this.searchResults = res.message
			  this.saveSearchHistory()
			},
			gotoDetail(item){
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			saveSearchHistory(){
				//this.historyList.push(this.kw)
				const set = new Set(this.historyList);
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				 // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
				 uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			//清除搜索历史
			clean(){
				this.historyList = [],
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			}
		},
		computed:{
			// 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
		   // 而是应该新建一个内存无关的数组，再进行 reverse 反转
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box{
		position: sticky;
		top: 0;
		z-index: 999;
		background-color: #c00000;
	}
	.sugg-list {
	  padding: 0 5px;
	
	  .sugg-item {
	    font-size: 12px;
	    padding: 13px 0;
	    border-bottom: 1px solid #efefef;
	    display: flex;
	    align-items: center;
	    justify-content: space-between;
	
	    .goods-name {
	      // 文字不允许换行（单行文本）
	      white-space: nowrap;
	      // 溢出部分隐藏
	      overflow: hidden;
	      // 文本溢出后，使用 ... 代替
	      text-overflow: ellipsis;
	      margin-right: 3px;
	    }
	  }
	}
	.history-box {
	  padding: 0 5px;
	
	  .history-title {
	    display: flex;
	    justify-content: space-between;
	    align-items: center;
	    height: 40px;
	    font-size: 13px;
	    border-bottom: 1px solid #efefef;
	  }
	
	  .history-list {
	    display: flex;
	    flex-wrap: wrap;
	
	    .uni-tag {
	      margin-top: 5px;
	      margin-right: 5px;
	    }
	  }
	}
</style>
